| 摘要: |
| Irgarol 1051是一种常见的船舶防污剂，主要作用于光系统Ⅱ来抑制藻类在船舶表面的生长。本研究通过模拟原位海洋环境，在考虑阳光紫外辐射的基础上，于室外培养了3种不同粒径的硅藻，光系统Ⅱ初始光化学效率QY均介于0.60~0.70，表明藻细胞活性良好。在短期实验中加入Irgarol后，发现较低质量浓度（0.2 μg/L）已经显著抑制了硅藻光系统Ⅱ的活性，浓度升高后抑制效应随之升高，QY降至0.32左右，相对抑制率最高可达42%。通过比较分析不同光学处理下硅藻的响应，微弱的紫外辐射对3种硅藻光系统Ⅱ的抑制率很低，最高约为5%左右，而对于粒径最大的斑点海链藻基本不受影响。当在有Irgarol存在的情况下，紫外辐射抑制率明显升高，且粒径越小抑制率越大，最高约为10%。表明二者即使在低剂量情况下也会发生协同作用，这对真光层低光区域浮游植物群落的粒径结构和初级生产过程有潜在影响。 |
| 关键词: 硅藻 Irgarol 1051 光合作用 紫外辐射 |
| DOI：10.11759/hykx20210201002 |
| 分类号:P76;Q945.11 |
| 基金项目:国家自然科学基金资助项目（41876113）；江苏省自然科学基金资助项目（BK20181314）；江苏省研究生科研与实践创新计划项目（KYCX19-2285） |
|
| Interactive effect of Irgarol 1051 and ultraviolet radiation on photosystemⅡof three diatoms in a low-light environment |
|
DING Pei-jian, CAO Li-xin, JIA Fei, XU Jun-tian, WU Ya-ping
|
|
College of Marine Science and Fisheries, Jiangsu Ocean University, Lianyungang 222005, China
|
| Abstract: |
| As a commonly used antifoulant, Irgarol 1051 can act on the photosystemⅡ(PSⅡ) of photoautotrophs to inhibit the growth of algae on the surface of ships. In the present study, we cultivated three diatoms under natural sunlight and applied a neutral density screen to create a low-light environment. The dark-adapted photochemical yields were in the range of 0.60-0.70, which indicated that all cultures grew well. When the antifoulant was added, it significantly inhibited the PSII even at a low concentration (0.2 μg/L). Moreover, the photochemical yields decreased while the relative inhibition on PSII increased up to 42%. By analyzing the response of the diatoms under different radiation treatments, we found that the weak ultraviolet radiation (UVR) only had a slight inhibition on two small diatoms and that it had no effect on the largest diatom, with the maximal value being only 5%. However, the relative ultraviolet inhibition increased significantly in the presence of Irgarol 1051, and the smallest cells showed the highest inhibition of 10%. Results indicated a synergistic effect between Irgarol 1051 and low-level UVR that could potentially influence the size structure and primary production of phytoplankton assemblages in the low-light region of the euphotic zone. |
| Key words: diatom Irgarol 1051 photosynthesis ultraviolet radiation |
